APA (7th ed.) Citation

Gray, D. E., & Helmy, I. (1985). Recreation experience: The human dimension. [American Association for Leisure and Recreation].

Chicago Style (17th ed.) Citation

Gray, David E., and Ibrahim Helmy. Recreation Experience: The Human Dimension. [Reston, Va.]: [American Association for Leisure and Recreation], 1985.

MLA (9th ed.) Citation

Gray, David E., and Ibrahim Helmy. Recreation Experience: The Human Dimension. [American Association for Leisure and Recreation], 1985.